2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
21 #include <sys/types.h>
25 #include <uuid/uuid.h>
26 #include "kerncompat.h"
27 #include "radix-tree.h"
31 #include "transaction.h"
34 #include "print-tree.h"
35 #include "rbtree-utils.h"
37 /* specified errno for check_tree_block */
38 #define BTRFS_BAD_BYTENR (-1)
39 #define BTRFS_BAD_FSID (-2)
40 #define BTRFS_BAD_LEVEL (-3)
41 #define BTRFS_BAD_NRITEMS (-4)
43 /* Calculate max possible nritems for a leaf/node */
44 static u32 max_nritems(u8 level, u32 nodesize)
48 return ((nodesize - sizeof(struct btrfs_header)) /
49 sizeof(struct btrfs_item));
50 return ((nodesize - sizeof(struct btrfs_header)) /
51 sizeof(struct btrfs_key_ptr));
54 static int check_tree_block(struct btrfs_fs_info *fs_info,
55 struct extent_buffer *buf)
58 struct btrfs_fs_devices *fs_devices;
59 u32 nodesize = fs_info->nodesize;
60 int ret = BTRFS_BAD_FSID;
62 if (buf->start != btrfs_header_bytenr(buf))
63 return BTRFS_BAD_BYTENR;
64 if (btrfs_header_level(buf) >= BTRFS_MAX_LEVEL)
65 return BTRFS_BAD_LEVEL;
66 if (btrfs_header_nritems(buf) > max_nritems(btrfs_header_level(buf),
68 return BTRFS_BAD_NRITEMS;
70 /* Only leaf can be empty */
71 if (btrfs_header_nritems(buf) == 0 &&
72 btrfs_header_level(buf) != 0)
73 return BTRFS_BAD_NRITEMS;
75 fs_devices = fs_info->fs_devices;
77 if (fs_info->ignore_fsid_mismatch ||
78 !memcmp_extent_buffer(buf, fs_devices->fsid,
84 fs_devices = fs_devices->seed;
89 static void print_tree_block_error(struct btrfs_fs_info *fs_info,
90 struct extent_buffer *eb,
93 char fs_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
94 char found_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
95 u8 buf[BTRFS_UUID_SIZE];
99 read_extent_buffer(eb, buf, btrfs_header_fsid(),
101 uuid_unparse(buf, found_uuid);
102 uuid_unparse(fs_info->fsid, fs_uuid);
103 fprintf(stderr, "fsid mismatch, want=%s, have=%s\n",
104 fs_uuid, found_uuid);
106 case BTRFS_BAD_BYTENR:
107 fprintf(stderr, "bytenr mismatch, want=%llu, have=%llu\n",
108 eb->start, btrfs_header_bytenr(eb));
110 case BTRFS_BAD_LEVEL:
111 fprintf(stderr, "bad level, %u > %u\n",
112 btrfs_header_level(eb), BTRFS_MAX_LEVEL);
114 case BTRFS_BAD_NRITEMS:
115 fprintf(stderr, "invalid nr_items: %u\n",
116 btrfs_header_nritems(eb));
121 u32 btrfs_csum_data(char *data, u32 seed, size_t len)
123 return crc32c(seed, data, len);
126 void btrfs_csum_final(u32 crc, u8 *result)
128 put_unaligned_le32(~crc, result);
131 static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
132 int verify, int silent)
134 u8 result[BTRFS_CSUM_SIZE];
138 len = buf->len - BTRFS_CSUM_SIZE;
139 crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
140 btrfs_csum_final(crc, result);
143 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
145 printk("checksum verify failed on %llu found %08X wanted %08X\n",
146 (unsigned long long)buf->start,
148 *((u32*)(char *)buf->data));
152 write_extent_buffer(buf, result, 0, csum_size);
157 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size, int verify)
159 return __csum_tree_block_size(buf, csum_size, verify, 0);
162 int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size)
164 return __csum_tree_block_size(buf, csum_size, 1, 1);
167 int csum_tree_block(struct btrfs_fs_info *fs_info,
168 struct extent_buffer *buf, int verify)
171 btrfs_super_csum_size(fs_info->super_copy);
172 if (verify && fs_info->suppress_check_block_errors)
173 return verify_tree_block_csum_silent(buf, csum_size);
174 return csum_tree_block_size(buf, csum_size, verify);
177 struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
178 u64 bytenr, u32 blocksize)
180 return find_extent_buffer(&fs_info->extent_cache,
184 struct extent_buffer* btrfs_find_create_tree_block(
185 struct btrfs_fs_info *fs_info, u64 bytenr)
187 return alloc_extent_buffer(&fs_info->extent_cache, bytenr,
191 void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
194 struct extent_buffer *eb;
196 struct btrfs_multi_bio *multi = NULL;
197 struct btrfs_device *device;
199 eb = btrfs_find_tree_block(fs_info, bytenr, fs_info->nodesize);
200 if (!(eb && btrfs_buffer_uptodate(eb, parent_transid)) &&
201 !btrfs_map_block(fs_info, READ, bytenr, &length, &multi, 0,
203 device = multi->stripes[0].dev;
205 readahead(device->fd, multi->stripes[0].physical,
209 free_extent_buffer(eb);
213 static int verify_parent_transid(struct extent_io_tree *io_tree,
214 struct extent_buffer *eb, u64 parent_transid,
219 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
222 if (extent_buffer_uptodate(eb) &&
223 btrfs_header_generation(eb) == parent_transid) {
227 printk("parent transid verify failed on %llu wanted %llu found %llu\n",
228 (unsigned long long)eb->start,
229 (unsigned long long)parent_transid,
230 (unsigned long long)btrfs_header_generation(eb));
232 eb->flags |= EXTENT_BAD_TRANSID;
233 printk("Ignoring transid failure\n");
239 clear_extent_buffer_uptodate(eb);
245 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
247 unsigned long offset = 0;
248 struct btrfs_multi_bio *multi = NULL;
249 struct btrfs_device *device;
252 unsigned long bytes_left = eb->len;
255 read_len = bytes_left;
258 if (!info->on_restoring &&
259 eb->start != BTRFS_SUPER_INFO_OFFSET) {
260 ret = btrfs_map_block(info, READ, eb->start + offset,
261 &read_len, &multi, mirror, NULL);
263 printk("Couldn't map the block %Lu\n", eb->start + offset);
267 device = multi->stripes[0].dev;
269 if (device->fd <= 0) {
276 eb->dev_bytenr = multi->stripes[0].physical;
280 /* special case for restore metadump */
281 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
282 if (device->devid == 1)
287 eb->dev_bytenr = eb->start;
291 if (read_len > bytes_left)
292 read_len = bytes_left;
294 ret = read_extent_from_disk(eb, offset, read_len);
298 bytes_left -= read_len;
303 struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
307 struct extent_buffer *eb;
308 u64 best_transid = 0;
309 u32 sectorsize = fs_info->sectorsize;
316 * Don't even try to create tree block for unaligned tree block
318 * Such unaligned tree block will free overlapping extent buffer,
319 * causing use-after-free bugs for fuzzed images.
321 if (bytenr < sectorsize || !IS_ALIGNED(bytenr, sectorsize)) {
322 error("tree block bytenr %llu is not aligned to sectorsize %u",
324 return ERR_PTR(-EIO);
327 eb = btrfs_find_create_tree_block(fs_info, bytenr);
329 return ERR_PTR(-ENOMEM);
331 if (btrfs_buffer_uptodate(eb, parent_transid))
335 ret = read_whole_eb(fs_info, eb, mirror_num);
336 if (ret == 0 && csum_tree_block(fs_info, eb, 1) == 0 &&
337 check_tree_block(fs_info, eb) == 0 &&
338 verify_parent_transid(eb->tree, eb, parent_transid, ignore)
340 if (eb->flags & EXTENT_BAD_TRANSID &&
341 list_empty(&eb->recow)) {
342 list_add_tail(&eb->recow,
343 &fs_info->recow_ebs);
346 btrfs_set_buffer_uptodate(eb);
350 if (check_tree_block(fs_info, eb)) {
351 if (!fs_info->suppress_check_block_errors)
352 print_tree_block_error(fs_info, eb,
353 check_tree_block(fs_info, eb));
355 if (!fs_info->suppress_check_block_errors)
356 fprintf(stderr, "Csum didn't match\n");
361 num_copies = btrfs_num_copies(fs_info, eb->start, eb->len);
362 if (num_copies == 1) {
366 if (btrfs_header_generation(eb) > best_transid && mirror_num) {
367 best_transid = btrfs_header_generation(eb);
368 good_mirror = mirror_num;
371 if (mirror_num > num_copies) {
372 mirror_num = good_mirror;
377 free_extent_buffer(eb);
381 int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical,
382 u64 *len, int mirror)
385 struct btrfs_multi_bio *multi = NULL;
386 struct btrfs_device *device;
390 ret = btrfs_map_block(fs_info, READ, logical, len, &multi, mirror,
393 fprintf(stderr, "Couldn't map the block %llu\n",
397 device = multi->stripes[0].dev;
404 ret = pread64(device->fd, data, *len, multi->stripes[0].physical);
414 int write_and_map_eb(struct btrfs_fs_info *fs_info, struct extent_buffer *eb)
419 u64 *raid_map = NULL;
420 struct btrfs_multi_bio *multi = NULL;
424 ret = btrfs_map_block(fs_info, WRITE, eb->start, &length,
425 &multi, 0, &raid_map);
428 ret = write_raid56_with_parity(fs_info, eb, multi,
431 } else while (dev_nr < multi->num_stripes) {
433 eb->fd = multi->stripes[dev_nr].dev->fd;
434 eb->dev_bytenr = multi->stripes[dev_nr].physical;
435 multi->stripes[dev_nr].dev->total_ios++;
437 ret = write_extent_to_disk(eb);
445 int write_tree_block(struct btrfs_trans_handle *trans,
446 struct btrfs_fs_info *fs_info,
447 struct extent_buffer *eb)
449 if (check_tree_block(fs_info, eb)) {
450 print_tree_block_error(fs_info, eb,
451 check_tree_block(fs_info, eb));
455 if (trans && !btrfs_buffer_uptodate(eb, trans->transid))
458 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
459 csum_tree_block(fs_info, eb, 0);
461 return write_and_map_eb(fs_info, eb);
464 void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
468 root->commit_root = NULL;
470 root->track_dirty = 0;
472 root->fs_info = fs_info;
473 root->objectid = objectid;
474 root->last_trans = 0;
475 root->last_inode_alloc = 0;
477 INIT_LIST_HEAD(&root->dirty_list);
478 INIT_LIST_HEAD(&root->orphan_data_extents);
479 memset(&root->root_key, 0, sizeof(root->root_key));
480 memset(&root->root_item, 0, sizeof(root->root_item));
481 root->root_key.objectid = objectid;
484 static int update_cowonly_root(struct btrfs_trans_handle *trans,
485 struct btrfs_root *root)
489 struct btrfs_root *tree_root = root->fs_info->tree_root;
491 btrfs_write_dirty_block_groups(trans, root);
493 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
494 if (old_root_bytenr == root->node->start)
496 btrfs_set_root_bytenr(&root->root_item,
498 btrfs_set_root_generation(&root->root_item,
500 root->root_item.level = btrfs_header_level(root->node);
501 ret = btrfs_update_root(trans, tree_root,
505 btrfs_write_dirty_block_groups(trans, root);
510 static int commit_tree_roots(struct btrfs_trans_handle *trans,
511 struct btrfs_fs_info *fs_info)
513 struct btrfs_root *root;
514 struct list_head *next;
515 struct extent_buffer *eb;
518 if (fs_info->readonly)
521 eb = fs_info->tree_root->node;
522 extent_buffer_get(eb);
523 ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
524 free_extent_buffer(eb);
528 while(!list_empty(&fs_info->dirty_cowonly_roots)) {
529 next = fs_info->dirty_cowonly_roots.next;
531 root = list_entry(next, struct btrfs_root, dirty_list);
532 update_cowonly_root(trans, root);
533 free_extent_buffer(root->commit_root);
534 root->commit_root = NULL;
540 static int __commit_transaction(struct btrfs_trans_handle *trans,
541 struct btrfs_root *root)
545 struct btrfs_fs_info *fs_info = root->fs_info;
546 struct extent_buffer *eb;
547 struct extent_io_tree *tree = &fs_info->extent_cache;
551 ret = find_first_extent_bit(tree, 0, &start, &end,
555 while(start <= end) {
556 eb = find_first_extent_buffer(tree, start);
557 BUG_ON(!eb || eb->start != start);
558 ret = write_tree_block(trans, fs_info, eb);
561 clear_extent_buffer_dirty(eb);
562 free_extent_buffer(eb);
568 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
569 struct btrfs_root *root)
571 u64 transid = trans->transid;
573 struct btrfs_fs_info *fs_info = root->fs_info;
575 if (root->commit_root == root->node)
577 if (root == root->fs_info->tree_root)
579 if (root == root->fs_info->chunk_root)
582 free_extent_buffer(root->commit_root);
583 root->commit_root = NULL;
585 btrfs_set_root_bytenr(&root->root_item, root->node->start);
586 btrfs_set_root_generation(&root->root_item, trans->transid);
587 root->root_item.level = btrfs_header_level(root->node);
588 ret = btrfs_update_root(trans, root->fs_info->tree_root,
589 &root->root_key, &root->root_item);
592 ret = commit_tree_roots(trans, fs_info);
594 ret = __commit_transaction(trans, root);
596 write_ctree_super(trans, fs_info);
597 btrfs_finish_extent_commit(trans, fs_info->extent_root,
598 &fs_info->pinned_extents);
600 free_extent_buffer(root->commit_root);
601 root->commit_root = NULL;
602 fs_info->running_transaction = NULL;
603 fs_info->last_trans_committed = transid;
607 static int find_and_setup_root(struct btrfs_root *tree_root,
608 struct btrfs_fs_info *fs_info,
609 u64 objectid, struct btrfs_root *root)
614 btrfs_setup_root(root, fs_info, objectid);
615 ret = btrfs_find_last_root(tree_root, objectid,
616 &root->root_item, &root->root_key);
620 generation = btrfs_root_generation(&root->root_item);
621 root->node = read_tree_block(fs_info,
622 btrfs_root_bytenr(&root->root_item), generation);
623 if (!extent_buffer_uptodate(root->node))
629 static int find_and_setup_log_root(struct btrfs_root *tree_root,
630 struct btrfs_fs_info *fs_info,
631 struct btrfs_super_block *disk_super)
633 u64 blocknr = btrfs_super_log_root(disk_super);
634 struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
644 btrfs_setup_root(log_root, fs_info,
645 BTRFS_TREE_LOG_OBJECTID);
647 log_root->node = read_tree_block(fs_info, blocknr,
648 btrfs_super_generation(disk_super) + 1);
650 fs_info->log_root_tree = log_root;
652 if (!extent_buffer_uptodate(log_root->node)) {
653 free_extent_buffer(log_root->node);
655 fs_info->log_root_tree = NULL;
662 int btrfs_free_fs_root(struct btrfs_root *root)
665 free_extent_buffer(root->node);
666 if (root->commit_root)
667 free_extent_buffer(root->commit_root);
672 static void __free_fs_root(struct rb_node *node)
674 struct btrfs_root *root;
676 root = container_of(node, struct btrfs_root, rb_node);
677 btrfs_free_fs_root(root);
680 FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
682 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
683 struct btrfs_key *location)
685 struct btrfs_root *root;
686 struct btrfs_root *tree_root = fs_info->tree_root;
687 struct btrfs_path *path;
688 struct extent_buffer *l;
692 root = calloc(1, sizeof(*root));
694 return ERR_PTR(-ENOMEM);
695 if (location->offset == (u64)-1) {
696 ret = find_and_setup_root(tree_root, fs_info,
697 location->objectid, root);
705 btrfs_setup_root(root, fs_info,
708 path = btrfs_alloc_path();
711 return ERR_PTR(-ENOMEM);
714 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
721 read_extent_buffer(l, &root->root_item,
722 btrfs_item_ptr_offset(l, path->slots[0]),
723 sizeof(root->root_item));
724 memcpy(&root->root_key, location, sizeof(*location));
727 btrfs_free_path(path);
732 generation = btrfs_root_generation(&root->root_item);
733 root->node = read_tree_block(fs_info,
734 btrfs_root_bytenr(&root->root_item), generation);
735 if (!extent_buffer_uptodate(root->node)) {
737 return ERR_PTR(-EIO);
744 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
747 u64 objectid = *((u64 *)data);
748 struct btrfs_root *root;
750 root = rb_entry(node, struct btrfs_root, rb_node);
751 if (objectid > root->objectid)
753 else if (objectid < root->objectid)
759 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
760 struct rb_node *node2)
762 struct btrfs_root *root;
764 root = rb_entry(node2, struct btrfs_root, rb_node);
765 return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
768 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
769 struct btrfs_key *location)
771 struct btrfs_root *root;
772 struct rb_node *node;
774 u64 objectid = location->objectid;
776 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
777 return fs_info->tree_root;
778 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
779 return fs_info->extent_root;
780 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
781 return fs_info->chunk_root;
782 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
783 return fs_info->dev_root;
784 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
785 return fs_info->csum_root;
786 if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
787 return fs_info->quota_enabled ? fs_info->quota_root :
790 BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
791 location->offset != (u64)-1);
793 node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
794 btrfs_fs_roots_compare_objectids, NULL);
796 return container_of(node, struct btrfs_root, rb_node);
798 root = btrfs_read_fs_root_no_cache(fs_info, location);
802 ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
803 btrfs_fs_roots_compare_roots);
808 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
810 if (fs_info->quota_root)
811 free(fs_info->quota_root);
813 free(fs_info->tree_root);
814 free(fs_info->extent_root);
815 free(fs_info->chunk_root);
816 free(fs_info->dev_root);
817 free(fs_info->csum_root);
818 free(fs_info->free_space_root);
819 free(fs_info->super_copy);
820 free(fs_info->log_root_tree);
824 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
826 struct btrfs_fs_info *fs_info;
828 fs_info = calloc(1, sizeof(struct btrfs_fs_info));
832 fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
833 fs_info->extent_root = calloc(1, sizeof(struct btrfs_root));
834 fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
835 fs_info->dev_root = calloc(1, sizeof(struct btrfs_root));
836 fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
837 fs_info->quota_root = calloc(1, sizeof(struct btrfs_root));
838 fs_info->free_space_root = calloc(1, sizeof(struct btrfs_root));
839 fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
841 if (!fs_info->tree_root || !fs_info->extent_root ||
842 !fs_info->chunk_root || !fs_info->dev_root ||
843 !fs_info->csum_root || !fs_info->quota_root ||
844 !fs_info->free_space_root || !fs_info->super_copy)
847 extent_io_tree_init(&fs_info->extent_cache);
848 extent_io_tree_init(&fs_info->free_space_cache);
849 extent_io_tree_init(&fs_info->block_group_cache);
850 extent_io_tree_init(&fs_info->pinned_extents);
851 extent_io_tree_init(&fs_info->pending_del);
852 extent_io_tree_init(&fs_info->extent_ins);
853 fs_info->excluded_extents = NULL;
855 fs_info->fs_root_tree = RB_ROOT;
856 cache_tree_init(&fs_info->mapping_tree.cache_tree);
858 mutex_init(&fs_info->fs_mutex);
859 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
860 INIT_LIST_HEAD(&fs_info->space_info);
861 INIT_LIST_HEAD(&fs_info->recow_ebs);
864 fs_info->readonly = 1;
866 fs_info->super_bytenr = sb_bytenr;
867 fs_info->data_alloc_profile = (u64)-1;
868 fs_info->metadata_alloc_profile = (u64)-1;
869 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
872 btrfs_free_fs_info(fs_info);
876 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb,
881 features = btrfs_super_incompat_flags(sb) &
882 ~BTRFS_FEATURE_INCOMPAT_SUPP;
884 printk("couldn't open because of unsupported "
885 "option features (%Lx).\n",
886 (unsigned long long)features);
890 features = btrfs_super_incompat_flags(sb);
891 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
892 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
893 btrfs_set_super_incompat_flags(sb, features);
896 features = btrfs_super_compat_ro_flags(sb);
897 if (flags & OPEN_CTREE_WRITES) {
898 if (flags & OPEN_CTREE_INVALIDATE_FST) {
899 /* Clear the FREE_SPACE_TREE_VALID bit on disk... */
900 features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID;
901 btrfs_set_super_compat_ro_flags(sb, features);
902 /* ... and ignore the free space tree bit. */
903 features &= ~BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE;
905 if (features & ~BTRFS_FEATURE_COMPAT_RO_SUPP) {
906 printk("couldn't open RDWR because of unsupported "
907 "option features (%Lx).\n",
908 (unsigned long long)features);
916 static int find_best_backup_root(struct btrfs_super_block *super)
918 struct btrfs_root_backup *backup;
919 u64 orig_gen = btrfs_super_generation(super);
924 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
925 backup = super->super_roots + i;
926 if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
927 btrfs_backup_tree_root_gen(backup) > gen) {
929 gen = btrfs_backup_tree_root_gen(backup);
935 static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
937 struct btrfs_root *info_root,
938 u64 objectid, char *str)
940 struct btrfs_root *root = fs_info->tree_root;
943 ret = find_and_setup_root(root, fs_info, objectid, info_root);
945 printk("Couldn't setup %s tree\n", str);
946 if (!(flags & OPEN_CTREE_PARTIAL))
949 * Need a blank node here just so we don't screw up in the
950 * million of places that assume a root has a valid ->node
953 btrfs_find_create_tree_block(fs_info, 0);
954 if (!info_root->node)
956 clear_extent_buffer_uptodate(info_root->node);
962 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
965 struct btrfs_super_block *sb = fs_info->super_copy;
966 struct btrfs_root *root;
967 struct btrfs_key key;
971 root = fs_info->tree_root;
972 btrfs_setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
973 generation = btrfs_super_generation(sb);
975 if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
976 root_tree_bytenr = btrfs_super_root(sb);
977 } else if (flags & OPEN_CTREE_BACKUP_ROOT) {
978 struct btrfs_root_backup *backup;
979 int index = find_best_backup_root(sb);
980 if (index >= BTRFS_NUM_BACKUP_ROOTS) {
981 fprintf(stderr, "Invalid backup root number\n");
984 backup = fs_info->super_copy->super_roots + index;
985 root_tree_bytenr = btrfs_backup_tree_root(backup);
986 generation = btrfs_backup_tree_root_gen(backup);
989 root->node = read_tree_block(fs_info, root_tree_bytenr, generation);
990 if (!extent_buffer_uptodate(root->node)) {
991 fprintf(stderr, "Couldn't read tree root\n");
995 ret = setup_root_or_create_block(fs_info, flags, fs_info->extent_root,
996 BTRFS_EXTENT_TREE_OBJECTID, "extent");
999 fs_info->extent_root->track_dirty = 1;
1001 ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
1004 printk("Couldn't setup device tree\n");
1007 fs_info->dev_root->track_dirty = 1;
1009 ret = setup_root_or_create_block(fs_info, flags, fs_info->csum_root,
1010 BTRFS_CSUM_TREE_OBJECTID, "csum");
1013 fs_info->csum_root->track_dirty = 1;
1015 ret = find_and_setup_root(root, fs_info, BTRFS_QUOTA_TREE_OBJECTID,
1016 fs_info->quota_root);
1018 free(fs_info->quota_root);
1019 fs_info->quota_root = NULL;
1021 fs_info->quota_enabled = 1;
1024 if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
1025 ret = find_and_setup_root(root, fs_info, BTRFS_FREE_SPACE_TREE_OBJECTID,
1026 fs_info->free_space_root);
1028 printk("Couldn't read free space tree\n");
1031 fs_info->free_space_root->track_dirty = 1;
1034 ret = find_and_setup_log_root(root, fs_info, sb);
1036 printk("Couldn't setup log root tree\n");
1037 if (!(flags & OPEN_CTREE_PARTIAL))
1041 fs_info->generation = generation;
1042 fs_info->last_trans_committed = generation;
1043 if (extent_buffer_uptodate(fs_info->extent_root->node) &&
1044 !(flags & OPEN_CTREE_NO_BLOCK_GROUPS)) {
1045 ret = btrfs_read_block_groups(fs_info->tree_root);
1047 * If we don't find any blockgroups (ENOENT) we're either
1048 * restoring or creating the filesystem, where it's expected,
1049 * anything else is error
1055 key.objectid = BTRFS_FS_TREE_OBJECTID;
1056 key.type = BTRFS_ROOT_ITEM_KEY;
1057 key.offset = (u64)-1;
1058 fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
1060 if (IS_ERR(fs_info->fs_root))
1065 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
1067 if (fs_info->free_space_root)
1068 free_extent_buffer(fs_info->free_space_root->node);
1069 if (fs_info->quota_root)
1070 free_extent_buffer(fs_info->quota_root->node);
1071 if (fs_info->csum_root)
1072 free_extent_buffer(fs_info->csum_root->node);
1073 if (fs_info->dev_root)
1074 free_extent_buffer(fs_info->dev_root->node);
1075 if (fs_info->extent_root)
1076 free_extent_buffer(fs_info->extent_root->node);
1077 if (fs_info->tree_root)
1078 free_extent_buffer(fs_info->tree_root->node);
1079 if (fs_info->log_root_tree)
1080 free_extent_buffer(fs_info->log_root_tree->node);
1081 if (fs_info->chunk_root)
1082 free_extent_buffer(fs_info->chunk_root->node);
1085 static void free_map_lookup(struct cache_extent *ce)
1087 struct map_lookup *map;
1089 map = container_of(ce, struct map_lookup, ce);
1093 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
1095 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
1097 while (!list_empty(&fs_info->recow_ebs)) {
1098 struct extent_buffer *eb;
1099 eb = list_first_entry(&fs_info->recow_ebs,
1100 struct extent_buffer, recow);
1101 list_del_init(&eb->recow);
1102 free_extent_buffer(eb);
1104 free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
1105 extent_io_tree_cleanup(&fs_info->extent_cache);
1106 extent_io_tree_cleanup(&fs_info->free_space_cache);
1107 extent_io_tree_cleanup(&fs_info->block_group_cache);
1108 extent_io_tree_cleanup(&fs_info->pinned_extents);
1109 extent_io_tree_cleanup(&fs_info->pending_del);
1110 extent_io_tree_cleanup(&fs_info->extent_ins);
1113 int btrfs_scan_fs_devices(int fd, const char *path,
1114 struct btrfs_fs_devices **fs_devices,
1115 u64 sb_bytenr, unsigned sbflags,
1123 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1125 seek_ret = lseek(fd, 0, SEEK_END);
1129 dev_size = seek_ret;
1130 lseek(fd, 0, SEEK_SET);
1131 if (sb_bytenr > dev_size) {
1132 error("superblock bytenr %llu is larger than device size %llu",
1133 (unsigned long long)sb_bytenr,
1134 (unsigned long long)dev_size);
1138 ret = btrfs_scan_one_device(fd, path, fs_devices,
1139 &total_devs, sb_bytenr, sbflags);
1141 fprintf(stderr, "No valid Btrfs found on %s\n", path);
1145 if (!skip_devices && total_devs != 1) {
1146 ret = btrfs_scan_devices();
1153 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info,
1154 u64 chunk_root_bytenr)
1156 struct btrfs_super_block *sb = fs_info->super_copy;
1160 btrfs_setup_root(fs_info->chunk_root, fs_info,
1161 BTRFS_CHUNK_TREE_OBJECTID);
1163 ret = btrfs_read_sys_array(fs_info);
1167 generation = btrfs_super_chunk_root_generation(sb);
1169 if (chunk_root_bytenr && !IS_ALIGNED(chunk_root_bytenr,
1170 fs_info->sectorsize)) {
1171 warning("chunk_root_bytenr %llu is unaligned to %u, ignore it",
1172 chunk_root_bytenr, fs_info->sectorsize);
1173 chunk_root_bytenr = 0;
1176 if (!chunk_root_bytenr)
1177 chunk_root_bytenr = btrfs_super_chunk_root(sb);
1181 fs_info->chunk_root->node = read_tree_block(fs_info,
1184 if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
1185 if (fs_info->ignore_chunk_tree_error) {
1186 warning("cannot read chunk root, continue anyway");
1187 fs_info->chunk_root = NULL;
1190 error("cannot read chunk root");
1195 if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
1196 ret = btrfs_read_chunk_tree(fs_info);
1198 fprintf(stderr, "Couldn't read chunk tree\n");
1205 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
1207 u64 root_tree_bytenr,
1208 u64 chunk_root_bytenr,
1211 struct btrfs_fs_info *fs_info;
1212 struct btrfs_super_block *disk_super;
1213 struct btrfs_fs_devices *fs_devices = NULL;
1214 struct extent_buffer *eb;
1217 unsigned sbflags = SBREAD_DEFAULT;
1220 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1222 /* try to drop all the caches */
1223 if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
1224 fprintf(stderr, "Warning, could not drop caches\n");
1226 fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
1228 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1231 if (flags & OPEN_CTREE_RESTORE)
1232 fs_info->on_restoring = 1;
1233 if (flags & OPEN_CTREE_SUPPRESS_CHECK_BLOCK_ERRORS)
1234 fs_info->suppress_check_block_errors = 1;
1235 if (flags & OPEN_CTREE_IGNORE_FSID_MISMATCH)
1236 fs_info->ignore_fsid_mismatch = 1;
1237 if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR)
1238 fs_info->ignore_chunk_tree_error = 1;
1240 if ((flags & OPEN_CTREE_RECOVER_SUPER)
1241 && (flags & OPEN_CTREE_FS_PARTIAL)) {
1243 "cannot open a partially created filesystem for recovery");
1247 if (flags & OPEN_CTREE_FS_PARTIAL)
1248 sbflags = SBREAD_PARTIAL;
1250 ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr, sbflags,
1251 (flags & OPEN_CTREE_NO_DEVICES));
1255 fs_info->fs_devices = fs_devices;
1256 if (flags & OPEN_CTREE_WRITES)
1261 if (flags & OPEN_CTREE_EXCLUSIVE)
1264 ret = btrfs_open_devices(fs_devices, oflags);
1268 disk_super = fs_info->super_copy;
1269 if (flags & OPEN_CTREE_RECOVER_SUPER)
1270 ret = btrfs_read_dev_super(fs_devices->latest_bdev, disk_super,
1271 sb_bytenr, SBREAD_RECOVER);
1273 ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr,
1276 printk("No valid btrfs found\n");
1280 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID &&
1281 !fs_info->ignore_fsid_mismatch) {
1282 fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
1286 memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1287 fs_info->sectorsize = btrfs_super_sectorsize(disk_super);
1288 fs_info->nodesize = btrfs_super_nodesize(disk_super);
1289 fs_info->stripesize = btrfs_super_stripesize(disk_super);
1291 ret = btrfs_check_fs_compatibility(fs_info->super_copy, flags);
1295 ret = btrfs_setup_chunk_tree_and_device_map(fs_info, chunk_root_bytenr);
1299 /* Chunk tree root is unable to read, return directly */
1300 if (!fs_info->chunk_root)
1303 eb = fs_info->chunk_root->node;
1304 read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1305 btrfs_header_chunk_tree_uuid(eb),
1308 ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
1309 if (ret && !(flags & __OPEN_CTREE_RETURN_CHUNK_ROOT) &&
1310 !fs_info->ignore_chunk_tree_error)
1316 btrfs_release_all_roots(fs_info);
1317 btrfs_cleanup_all_caches(fs_info);
1319 btrfs_close_devices(fs_devices);
1321 btrfs_free_fs_info(fs_info);
1325 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1326 u64 sb_bytenr, u64 root_tree_bytenr,
1327 u64 chunk_root_bytenr,
1332 struct btrfs_fs_info *info;
1333 int oflags = O_RDWR;
1336 ret = stat(filename, &st);
1338 error("cannot stat '%s': %s", filename, strerror(errno));
1341 if (!(((st.st_mode & S_IFMT) == S_IFREG) || ((st.st_mode & S_IFMT) == S_IFBLK))) {
1342 error("not a regular file or block device: %s", filename);
1346 if (!(flags & OPEN_CTREE_WRITES))
1349 fp = open(filename, oflags);
1351 error("cannot open '%s': %s", filename, strerror(errno));
1354 info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1355 chunk_root_bytenr, flags);
1360 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
1363 struct btrfs_fs_info *info;
1365 /* This flags may not return fs_info with any valid root */
1366 BUG_ON(flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR);
1367 info = open_ctree_fs_info(filename, sb_bytenr, 0, 0, flags);
1370 if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1371 return info->chunk_root;
1372 return info->fs_root;
1375 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1378 struct btrfs_fs_info *info;
1380 /* This flags may not return fs_info with any valid root */
1381 if (flags & OPEN_CTREE_IGNORE_CHUNK_TREE_ERROR) {
1382 error("invalid open_ctree flags: 0x%llx",
1383 (unsigned long long)flags);
1386 info = __open_ctree_fd(fp, path, sb_bytenr, 0, 0, flags);
1389 if (flags & __OPEN_CTREE_RETURN_CHUNK_ROOT)
1390 return info->chunk_root;
1391 return info->fs_root;
1395 * Check if the super is valid:
1396 * - nodesize/sectorsize - minimum, maximum, alignment
1397 * - tree block starts - alignment
1398 * - number of devices - something sane
1399 * - sys array size - maximum
1401 static int check_super(struct btrfs_super_block *sb, unsigned sbflags)
1403 u8 result[BTRFS_CSUM_SIZE];
1408 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
1409 if (btrfs_super_magic(sb) == BTRFS_MAGIC_PARTIAL) {
1410 if (!(sbflags & SBREAD_PARTIAL)) {
1411 error("superblock magic doesn't match");
1417 csum_type = btrfs_super_csum_type(sb);
1418 if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
1419 error("unsupported checksum algorithm %u", csum_type);
1422 csum_size = btrfs_csum_sizes[csum_type];
1425 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1426 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1427 btrfs_csum_final(crc, result);
1429 if (memcmp(result, sb->csum, csum_size)) {
1430 error("superblock checksum mismatch");
1433 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
1434 error("tree_root level too big: %d >= %d",
1435 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
1438 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
1439 error("chunk_root level too big: %d >= %d",
1440 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
1443 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
1444 error("log_root level too big: %d >= %d",
1445 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
1449 if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
1450 error("tree_root block unaligned: %llu", btrfs_super_root(sb));
1453 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
1454 error("chunk_root block unaligned: %llu",
1455 btrfs_super_chunk_root(sb));
1458 if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
1459 error("log_root block unaligned: %llu",
1460 btrfs_super_log_root(sb));
1463 if (btrfs_super_nodesize(sb) < 4096) {
1464 error("nodesize too small: %u < 4096",
1465 btrfs_super_nodesize(sb));
1468 if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
1469 error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
1472 if (btrfs_super_sectorsize(sb) < 4096) {
1473 error("sectorsize too small: %u < 4096",
1474 btrfs_super_sectorsize(sb));
1477 if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
1478 error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
1481 if (btrfs_super_total_bytes(sb) == 0) {
1482 error("invalid total_bytes 0");
1485 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
1486 error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
1489 if ((btrfs_super_stripesize(sb) != 4096)
1490 && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
1491 error("invalid stripesize %u", btrfs_super_stripesize(sb));
1495 if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
1496 char fsid[BTRFS_UUID_UNPARSED_SIZE];
1497 char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
1499 uuid_unparse(sb->fsid, fsid);
1500 uuid_unparse(sb->dev_item.fsid, dev_fsid);
1501 error("dev_item UUID does not match fsid: %s != %s",
1507 * Hint to catch really bogus numbers, bitflips or so
1509 if (btrfs_super_num_devices(sb) > (1UL << 31)) {
1510 warning("suspicious number of devices: %llu",
1511 btrfs_super_num_devices(sb));
1514 if (btrfs_super_num_devices(sb) == 0) {
1515 error("number of devices is 0");
1520 * Obvious sys_chunk_array corruptions, it must hold at least one key
1523 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
1524 error("system chunk array too big %u > %u",
1525 btrfs_super_sys_array_size(sb),
1526 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
1529 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
1530 + sizeof(struct btrfs_chunk)) {
1531 error("system chunk array too small %u < %zu",
1532 btrfs_super_sys_array_size(sb),
1533 sizeof(struct btrfs_disk_key) +
1534 sizeof(struct btrfs_chunk));
1541 error("superblock checksum matches but it has invalid members");
1545 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr,
1548 u8 fsid[BTRFS_FSID_SIZE];
1549 int fsid_is_initialized = 0;
1550 char tmp[BTRFS_SUPER_INFO_SIZE];
1551 struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
1554 int max_super = sbflags & SBREAD_RECOVER ? BTRFS_SUPER_MIRROR_MAX : 1;
1558 if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1559 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
1564 /* Not large enough sb, return -ENOENT instead of normal -EIO */
1565 if (ret < BTRFS_SUPER_INFO_SIZE)
1568 if (btrfs_super_bytenr(buf) != sb_bytenr)
1571 ret = check_super(buf, sbflags);
1574 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1579 * we would like to check all the supers, but that would make
1580 * a btrfs mount succeed after a mkfs from a different FS.
1581 * So, we need to add a special mount option to scan for
1582 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1585 for (i = 0; i < max_super; i++) {
1586 bytenr = btrfs_sb_offset(i);
1587 ret = pread64(fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
1588 if (ret < BTRFS_SUPER_INFO_SIZE)
1591 if (btrfs_super_bytenr(buf) != bytenr )
1593 /* if magic is NULL, the device was removed */
1594 if (btrfs_super_magic(buf) == 0 && i == 0)
1596 if (check_super(buf, sbflags))
1599 if (!fsid_is_initialized) {
1600 memcpy(fsid, buf->fsid, sizeof(fsid));
1601 fsid_is_initialized = 1;
1602 } else if (memcmp(fsid, buf->fsid, sizeof(fsid))) {
1604 * the superblocks (the original one and
1605 * its backups) contain data of different
1606 * filesystems -> the super cannot be trusted
1611 if (btrfs_super_generation(buf) > transid) {
1612 memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
1613 transid = btrfs_super_generation(buf);
1617 return transid > 0 ? 0 : -1;
1620 static int write_dev_supers(struct btrfs_fs_info *fs_info,
1621 struct btrfs_super_block *sb,
1622 struct btrfs_device *device)
1628 if (fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1629 btrfs_set_super_bytenr(sb, fs_info->super_bytenr);
1631 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1632 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1633 btrfs_csum_final(crc, &sb->csum[0]);
1636 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1637 * zero filled, we can use it directly
1639 ret = pwrite64(device->fd, fs_info->super_copy,
1640 BTRFS_SUPER_INFO_SIZE,
1641 fs_info->super_bytenr);
1642 if (ret != BTRFS_SUPER_INFO_SIZE)
1647 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1648 bytenr = btrfs_sb_offset(i);
1649 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1652 btrfs_set_super_bytenr(sb, bytenr);
1655 crc = btrfs_csum_data((char *)sb + BTRFS_CSUM_SIZE, crc,
1656 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1657 btrfs_csum_final(crc, &sb->csum[0]);
1660 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1661 * zero filled, we can use it directly
1663 ret = pwrite64(device->fd, fs_info->super_copy,
1664 BTRFS_SUPER_INFO_SIZE, bytenr);
1665 if (ret != BTRFS_SUPER_INFO_SIZE)
1673 fprintf(stderr, "WARNING: failed to write all sb data\n");
1675 fprintf(stderr, "WARNING: failed to write sb: %s\n",
1680 int write_all_supers(struct btrfs_fs_info *fs_info)
1682 struct list_head *cur;
1683 struct list_head *head = &fs_info->fs_devices->devices;
1684 struct btrfs_device *dev;
1685 struct btrfs_super_block *sb;
1686 struct btrfs_dev_item *dev_item;
1690 sb = fs_info->super_copy;
1691 dev_item = &sb->dev_item;
1692 list_for_each(cur, head) {
1693 dev = list_entry(cur, struct btrfs_device, dev_list);
1694 if (!dev->writeable)
1697 btrfs_set_stack_device_generation(dev_item, 0);
1698 btrfs_set_stack_device_type(dev_item, dev->type);
1699 btrfs_set_stack_device_id(dev_item, dev->devid);
1700 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1701 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1702 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1703 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1704 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1705 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1706 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1708 flags = btrfs_super_flags(sb);
1709 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1711 ret = write_dev_supers(fs_info, sb, dev);
1717 int write_ctree_super(struct btrfs_trans_handle *trans,
1718 struct btrfs_fs_info *fs_info)
1721 struct btrfs_root *tree_root = fs_info->tree_root;
1722 struct btrfs_root *chunk_root = fs_info->chunk_root;
1724 if (fs_info->readonly)
1727 btrfs_set_super_generation(fs_info->super_copy,
1729 btrfs_set_super_root(fs_info->super_copy,
1730 tree_root->node->start);
1731 btrfs_set_super_root_level(fs_info->super_copy,
1732 btrfs_header_level(tree_root->node));
1733 btrfs_set_super_chunk_root(fs_info->super_copy,
1734 chunk_root->node->start);
1735 btrfs_set_super_chunk_root_level(fs_info->super_copy,
1736 btrfs_header_level(chunk_root->node));
1737 btrfs_set_super_chunk_root_generation(fs_info->super_copy,
1738 btrfs_header_generation(chunk_root->node));
1740 ret = write_all_supers(fs_info);
1742 fprintf(stderr, "failed to write new super block err %d\n", ret);
1746 int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
1749 struct btrfs_trans_handle *trans;
1750 struct btrfs_root *root = fs_info->tree_root;
1752 if (fs_info->last_trans_committed !=
1753 fs_info->generation) {
1755 trans = btrfs_start_transaction(root, 1);
1756 btrfs_commit_transaction(trans, root);
1757 trans = btrfs_start_transaction(root, 1);
1758 ret = commit_tree_roots(trans, fs_info);
1760 ret = __commit_transaction(trans, root);
1762 write_ctree_super(trans, fs_info);
1766 if (fs_info->finalize_on_close) {
1767 btrfs_set_super_magic(fs_info->super_copy, BTRFS_MAGIC);
1768 root->fs_info->finalize_on_close = 0;
1769 ret = write_all_supers(fs_info);
1772 "failed to write new super block err %d\n", ret);
1774 btrfs_free_block_groups(fs_info);
1776 free_fs_roots_tree(&fs_info->fs_root_tree);
1778 btrfs_release_all_roots(fs_info);
1779 ret = btrfs_close_devices(fs_info->fs_devices);
1780 btrfs_cleanup_all_caches(fs_info);
1781 btrfs_free_fs_info(fs_info);
1785 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1786 struct extent_buffer *eb)
1788 return clear_extent_buffer_dirty(eb);
1791 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1793 set_extent_buffer_dirty(eb);
1796 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1800 ret = extent_buffer_uptodate(buf);
1804 ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1808 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1810 return set_extent_buffer_uptodate(eb);